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Using dm-verity may be useful for any read-only filesystem read from a block device, the new hook will build the required hash tree if enabled by a per-filesystem config option. To use this hook, the filesystem config must define a boolean option BR2_TARGET_ROOTFS_<FS>_VERITY, and a string option BR2_TARGET_ROOTFS_<FS>_VERITY_EXTRA_ARGS. The latter option allows users to override veritysetup defaults, e.g. to set a fixed hash algorithm. In the filesystem .mk file ROOTFS_<FS>_VERITY_EXTRA_ARGS must be defined as the value of BR2_TARGET_ROOTFS_<FS>_VERITY_EXTRA_ARGS without surrounding quotes, because utils/check-symbols warns about the _EXTRA_ARGS symbol being unused if fs/common.mk uses $(qstrip $(BR2_TARGET_ROOTFS_$(2)_VERITY_EXTRA_ARGS)) directly. Signed-off-by: Fiona Klute (othermo GmbH) <fiona.klute@gmx.de> Signed-off-by: Julien Olivain <ju.o@free.fr>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at https://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches